Dentists warn us that too many sweets can cause cavities. In fact, it’s not candy, but bacteria on the tooth surface that cause tooth decay. If you reduce the amount of cavity-causing bacteria, the number of cavities should decrease. Christine Lang of the Berlin biotech firm ORGANOBALANCE and her colleagues have developed a candy that can do this. This candy contains dead bacteria that bind to the bacteria most likely to cause cavities. Subjects who ate the candy had reduced levels of “bad” bacteria in their mouths.